Likely Population-Level Effects of Contaminants on a Resident Estuarine Fish Species: Comparing <Emphasis Type="Italic">Gillichthys mirabilis</Emphasis> Population Static Measurements and Vital Rates in San Francisco and Tomales Bays |
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| Authors: | Catherine R McGourty James A Hobbs William A Bennett Peter G Green Hyun-Min Hwang Naoaki Ikemiyagi Levi Lewis Jason M Cope |
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| Institution: | (1) Bodega Marine Lab, University of California, Davis, CA, USA;(2) Department of Environmental and Civil Engineering, University of California Davis, Davis, CA, USA;(3) Fishery Resource Analysis and Monitoring Division, National Marine Fisheries Service, Seattle, WA, USA |
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| Abstract: | Gillichthys mirabilis population static measurements (abundance, age, and size class structures) and vital rates (growth, mortality, recruitment)
were monitored on an annual basis from 2002 to 2007. Population-level metrics were used to gauge habitat quality at two study
sites (a contaminated site and a reference site) in two large northern California estuaries (San Francisco and Tomales Bays).
San Francisco Bay populations exhibited slower growth and higher mortality rates and contained higher amounts of contaminants
than Tomales Bay. Recruitment rates were highest at contaminated sites (Stege Marsh and Walker Creek) in 3 years out of 5 years,
suggesting low adult survival. This study suggests that population-level effects on a residential fish may be attributed to
estuarine contamination on the US Pacific coast. |
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